gcc/testsuite/gcc.dg/va-arg-pack-len-2.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2" } */
   3
   4 #include <stdarg.h>
   5
   6 extern int error_open_missing_mode (void)
   7   __attribute__((__error__ ("open with O_CREAT needs 3 arguments, only 2 were given")));
   8 extern int warn_open_too_many_arguments (void)
   9   __attribute__((__warning__ ("open called with more than 3 arguments")));
  10
  11 extern int myopen2 (const char *path, int oflag);
  12 extern int myopenva (const char *path, int oflag, ...);
  13
  14 extern inline __attribute__((always_inline, gnu_inline)) int
  15 myopen (const char *path, int oflag, ...)
  16 {
  17   if (__builtin_va_arg_pack_len () > 1)
  18     warn_open_too_many_arguments ();    /* { dg-warning "called with more than 3" } */
  19
  20   if (__builtin_constant_p (oflag))
  21     {
  22       if ((oflag & 0x40) != 0 && __builtin_va_arg_pack_len () < 1)
  23         {
  24           error_open_missing_mode ();   /* { dg-error "needs 3 arguments, only 2 were given" } */
  25           return myopen2 (path, oflag);
  26         }
  27       return myopenva (path, oflag, __builtin_va_arg_pack ());
  28     }
  29
  30   if (__builtin_va_arg_pack_len () < 1)
  31     return myopen2 (path, oflag);
  32
  33   return myopenva (path, oflag, __builtin_va_arg_pack ());
  34 }
  35
  36 int
  37 main (void)
  38 {
  39   myopen ("h", 0x43);
  40   myopen ("i", 0x43, 0644, 0655);
  41   return 0;
  42 }